table{
    border: 1px solid black;
    border-collapse: collapse;
    width: 600px;
    margin: 0 auto;
}
tr,td,th{
    border: 1px solid black;
    text-align: center;
}
tbody tr{
    height: 100px;
}
tbody td:nth-child(4) button{
    width: 20px;
}
.fix{
    position: fixed;
    width: 300px;
    height: 150px;
    top: 10%;
    left: 40%;
    background-color: aliceblue;
    border: 1px solid black;
    display: none;
}